Some users may see 3194 errors when trying to restore iPhone using iTunes. ITunes display dialog box, indicating "failed to restore the iPhone occurred in the unknown error" and followed by the error number 3194.

In fact, to fix iPhone or iTunes Error 3419, what you need is the all-in-one data & system recovery program - iOS System Recovery. With the helps of this tool, you can easily repair all kinds of system failures, including stucking in recovery mode/apple logo/apple screen/iTunes errors and so on.

3 Simple Steps to Fix iPhone or iTunes Error 3419 Without Losing Data

Step 1. Choose the Repair iOS System feature
Step 2. Download and select firmware
Step 3. Fix your iOS to return it to normal

Read more:

Recover iPhone stuck on recovery mode

Recover iPhone From Frozen Apple Screen